Online methods, also known as tracking-by-detection, detect instances in each frame and then match the detected instances in a frame-by-frame manner.
MaskTrack R-CNN [1]} is the first online method for VIS, with a tracking head added upon Mask R-CNN [2]} to predict tracking embeddings of all the detected instances and then use them for instance matching in videos.
Similar methods include VPSNet [3]} and TrackR-CNN [4]}.
Other methods, , CrossVIS [5]} and STC [6]}, adopt a similar tracking head, but are built upon CondInst [7]} instead of Mask R-CNN.
